Speed-indicator.



PATENTED DEC. 13, 1904.

C. G. B. HOLMAN.

SPE

APPLIUATION FILED mm: 13, 1904.

ED INDICATOR.

H0 MODEL.

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PATENT sPeen inmoarnn.

SPECIFICATION forming part of'Let'ters Patent No. 777,3?1, dated December 13, 1904,

Application filed June 13, 1904- Diss, Norfolk, England, have invented certain'new and useful Improvements in Speedllndicators', of which the following is a speci lica'tion.

This invention relates to speed-indiciitors for cycles, automobiles, and machinery gens erally; and it has for its object to provide a self-contained device of this class capable of positively indicating the rate of travel or of rotation in absolute measurements Without involving a time equationthat is, the device will automatically indicate at how many miles per hour, feet per se'conch or other rate the vehicle is moving, or it will indicate the number of revolutions in unit time of a steam-engine or the like without going through the stages oi estimating the distance traveled in a given time and then "calculating the rate elf travel by dividing by the number of time units taken.

The invention is illustrated by the accompanying drawings, in which--- Figure 1 is a sectional plan, and Fig. 52 a sectional elevation more or. less diagram-- matic, illustrating one form, 01. carrying out my invention. ldigs. 3 and dare respectively sectional plan and sectionai elevation show ing a modification.

Referring to l i l and 2., the device therein shown comprises a casing A, of metal or other Isuitable material, of substantially cylindrical form and having a transparent face. Axially through said, casing is carried a spindle M, to which fixed one end of a coil-spring S, the other end of which spring is secured to the wall of the casing A. Secured upon the said spindle Mis a c0g-wheel B, with which wheel B gearsa smaller wheel l mounted on the spindle U. On the said spindle O is also mounted thewheel U and theratchet-wheel E. A wheel Dis free to move on the spindle 0 and is provided with an escapement attachment G. A pawl'H, fitted upon the wheel D and acting on the ratchet-teeth of the wheel E, allows the wheel D to be turned in one d i.

Serial K117212371: (N0 model.)

of the casing A is passed a spindle T, from the ends of which project arms K L, fixed perpendicularly to said spindle 'l and disposed at equal distances apart. within the casing A engage the wheel (.3, the device being placed in such a position that the arms IJ-are moved round in succession by "'aprojection-fixed to a rotating part of the machine the speed of which is to he registered- The central spindlc'M has fitted to it an index-pointer P, and this pointer l indicates the speed directly on the dial.

Owing to the-revolution of the wheel, the fixed projection above mentioned turns the arms L in succession and so, also, the arms K, which arms It rotate the wheel O and pinion F, which in turn rotate the wheel B, spindle M, and pointer P, and the spring Q is compressed. VVhen the projection has passed the successive arms L, the spring; S uncoils somewhat and moves thewheel B and the pointer P backward, but is retarded by the escapemcnt G. Vlhen the spring {*5 has been compressed to a certain degree, the indicator is moved hacli hythespring just as far as it is moved forward at each revolution of the wheel by the action of the said projection on the said arms, and the pointer remains practically stationary until the speed of revolution of the wheel is altered. Then the indicator either moves forward or backward until the compression of the spring ll is such as to counterbalance the tendency to move forward under the action of the seal pro ecHon.

in the case of the application of the inven- Il tion to a wheel or any rotating part of a stationary engine or the like the indicator shows directly on the dial the number of revolutionsper minnte or other time unit of the rotating part. f the 3 ointer indicates, say, the figure 10' on the dial, the device is recording the fact that the wheel is revolving at the rate of ten revolutions to the second,

lhe arms K projection on the wheel the speed of rotation of which is being measured, and the said lever returns to its original position under the ac tion of a spring Fl The said leverl is mounted Z is secured within the c'asingA a parallel lever k, at the free end of which ispivoted a p- ,wl It, kept in engagement with the ratchetwheel a by means of a spring k. A pin is is fitted on the casing A, so as to move the said pawl 70' out of engagementwith theratchetwheel, and thus allow the said ratchet-wheel to move backward. The gearing and escapement mechanism maybe the same as in the previous modification; but the coil-spring 8 is contained within a small disk-like box s'on the top of the casing, as shown in Fig. 4-.

It is to be understood that'myinvention is not limited to the details of construction shown and descr .bed, as these may be varied without departing from the spirit of the invention,

What I claim as my invention, and desire to secure by Letters Patent, isl. The 'Lerein described speed indicator comprising, in combination, a casing, a spindie, a rotary measuring device carried by said spindle, a second spindle, gear-wheels carried by said spindles, means adapted to be actuated by a moving part external to the indicator and operating through said gear-wheels to rotate" said measuring device, resilient means tending to move said measuring device in the opposite direction, and means adapted to retard the movement of said measuring device under the action of said resilient moving means, as and for the purpose set forth.

2. The herein described speed indicator comprising, in combination, a casing, a spindle, a pointer carried by said spindle, a second external to the casing; but on the same pivot be actuated by a moving part external to the indicator and operating through said gearwheels to rotate said pointer, a spring tending to move said pointer in the opposite direction spindle, gear-wheels carried by said spindles, 45

and means adapted to retard the movement of said pointer under the action of, said spring,

as and for the purpose set forthx 3. The improved speed-indicator, coingris '55,

pin-

ing, in combination, a casin seems dle,a cog-wheel on said spin lo, a second 'spin. die, a cog-wheel on said espindlejin gear with said first-mentioned 'wheeha toothed wheel and a ratchet-wheel fixed to said second spin-f1 dle, atoothed wheel loosely mounted'on said second spindle, an escapement device acting on said loose wheel, a pawl on said loose wheel adapted to engage said ratchet-wheel, means adapted to be'actuated by a rotating part externalth the indicator to rotate said fixed toothed wheel, an index-pointer mounted onlf said central spindle, and a spring tending to movebackgsaid central spindle against the forward feeding motion imparted from said toothedwheel, as and'forthe purpose set forth.

. 4.. The improvedspeed-indicator, comprising, in combination, the casing-A, central spindle M, 'og-whe'eLB'fixed to-said spindle M, spindle O,.pinioi1 F, ratchetwheel E and toothed wheel-e fixed to said spindle O, toothed wheel D loose on'said spindle O, pawl H secured to the wheel D and engaging the ratchetteeth of wheel E, e'scapement G, levers Z, k, spring Z pawl k, spring k pin k springs,

and pointer P, as shown and described.

In testimony whereof I- have signed my name to this specification in the presence of two subscribing witnesses.

CHARLES GEORGE llRINSMEAD HOLMAN. l/Vitnesse's:

VVALLAGE CRANSTON FAIRWEATHER,

JAMES WRIGHT. 

